Liheng Ying and  Guangjiong Sun,  Surge Protection of Power Supply used for Automation Devices in Power Distribution System.   journal   = {International Journal of Electrical and Computer Engineering}, [online]. World Academy of Science, Engineering and Technology.
    March 2010, vol. 39(3). 605 - 609
    [viewed 27 April 2024]. Available from: https://publications.waset.org/pdf/7767.